The original Visible plan used a cloud-based service with proxy servers that separated it from the main Verizon network. This is the reason why latency on the now grandfathered Visible plan was historically so high compared to standard cellular connections - a connection had to pass through the cloud-based network.
The new plans operate directly on the Verizon network. Generally, this yields better latency (lower ping times) as well as access to Verizon's domestic roaming partners that increases coverage for Visible customers on the new plans.
This change required new physical SIMs or eSIMs. For many including myself it was a rough transition but at least for me was worth the aggravation. Without installing and activating the new SIMs you'll likely remain on the grandfathered plans (which will eventually go away). I would hope by now Visible has sorted out the initial flurry of activation problems for the new plans.
